package com.hmdp.utils;

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
public class RedisIdWoker {
    @Resource
    private StringRedisTemplate stringRedisTemplate;
    private static final long BEGIN_TIMESTAMP= 1640995299L;
    private  static  final int COUNT_BITS = 32;
    public long nextId(String keyPrefix){
        //生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timestamp = nowSecond-BEGIN_TIMESTAMP;
        //生成序列号
        String date = now.format(DateTimeFormatter.ofPattern("yyyyMMdd"));
        Long count = stringRedisTemplate.opsForValue().increment("icr:" + keyPrefix + ":" + date);

        return timestamp << COUNT_BITS | count;
    }
}
